# Central AC Troubleshooting

**URL:** <https://boards.straightdope.com/t/central-ac-troubleshooting/627017>\
**Category:** Factual Questions\
**Created:** [July 2, 2012, 6:15pm UTC](https://boards.straightdope.com/t/central-ac-troubleshooting/627017 "2012-07-02T18:15:49Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![The\_Second\_Stone](https://avatars.discourse-cdn.com/v4/letter/t/bbe5ce/32.png) [@The\_Second\_Stone](https://boards.straightdope.com/u/The_Second_Stone)\
**Post date:** [July 25, 2013, 4:45am UTC](https://boards.straightdope.com/t/central-ac-troubleshooting/627017/22 "2013-07-25T04:45:32Z")

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I live where there are many 100 plus days in the summer (spring and fall too). And I work at home. HVAC is absolutely essential to my job and non-job comfort. I spend $200 a year, $100 in the spring and $100 in the fall to have HVAC pros come out and inspect everything. The system is way too expensive and necessary to not take care of.

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**Author:** ![Snnipe\_70E](https://avatars.discourse-cdn.com/v4/letter/s/b5a626/32.png) [@Snnipe\_70E](https://boards.straightdope.com/u/Snnipe_70E)\
**Post date:** [July 25, 2013, 5:01am UTC](https://boards.straightdope.com/t/central-ac-troubleshooting/627017/23 "2013-07-25T05:01:43Z")

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> [@carnivorousplant](#):
>
> In Engineering speak, Delta T is the temperature difference between outside and what you want the inside to be. 🙂

Nit pick. In engineering terms Delta T is the temperature difference between two different measuring points.  
Inside vs outside  
Inlet Vs outlet or exhaust  
supply VS return

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**Author:** ![Snnipe\_70E](https://avatars.discourse-cdn.com/v4/letter/s/b5a626/32.png) [@Snnipe\_70E](https://boards.straightdope.com/u/Snnipe_70E)\
**Post date:** [July 25, 2013, 5:06am UTC](https://boards.straightdope.com/t/central-ac-troubleshooting/627017/24 "2013-07-25T05:06:08Z")

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> [@The\_Second\_Stone](#):
>
> I live where there are many 100 plus days in the summer (spring and fall too). And I work at home. HVAC is absolutely essential to my job and non-job comfort. I spend $200 a year, $100 in the spring and $100 in the fall to have HVAC pros come out and inspect everything. The system is way too expensive and necessary to not take care of.

Bingo we have a wise winner here

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**Author:** ![Tim\_T-Bonham.net](https://avatars.discourse-cdn.com/v4/letter/t/46a35a/32.png) [@Tim\_T-Bonham.net](https://boards.straightdope.com/u/Tim_T-Bonham.net)\
**Post date:** [July 25, 2013, 6:22pm UTC](https://boards.straightdope.com/t/central-ac-troubleshooting/627017/25 "2013-07-25T18:22:11Z")

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> [@Snnipe\_70E](#):
>
> Bingo we have a wise winner here

Except for the fact that he chooses to live in a place like that.

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